We have covered 2 free online tools and 4 free software to add watermark to PDF in Windows 11/10. These are: Sejda is a free online tool to add a watermark to PDF files. Its free version lets you ...

Gimp is normally used to create or manipulate images files, but can also work with PDFs if you understand how it works and what it's limits are. If you’ve never used Gimp—a free image editor available ...